/Engine/Source/Runtime/RenderCore/Public/VertexFactory.h
Default PrimitiveId vertex buffer. Contains a single index of 0. This is used when the VF is used for rendering outside normal mesh passes, where there is no valid scene.
class FPrimitiveIdDummyBuffer : public [FVertexBuffer](API\Runtime\RenderCore\FVertexBuffer)
FShaderResource...
VertexBufferSRV